potassium

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Hassan, A. A., S. A. Shehata, and M. A. Elhelaly, Nature and factors affecting black spot in potato , , giza, cairo, 2001.
Badawy, M. A., S. A. Shehata, A. M. Elbehary, and Z. F. Fawezy, Effect of sowing dates and foliar spray With phosphorus and potassium on growth and yield of cowpea , , giza, c, 1997.
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